Select Live Data and the HM-6 will give the instantaneous weight in dynamic form, i.e. it will indicate the weight on the HM-6 even if it changes, similar to how the HM-20 (1st gen scale) worked.
1.) From the Monitor List, select the HM-6 to tare by tapping on the "circled i" next to that HM-6.
2.) Select the Live Data option.
3.) Place the top of the iPhone flat against the HM-6 electronic module and wait for 5 seconds until the Bluetooth connection is established with the appearance of the weight and temperature dials.
Tip: NFC reads trigger the Bluetooth connection on for a few seconds. If you are quick, you can do a NFC read, tap on the "circled i" and "Live Data" and it will jump to the Live Data screen, step 4, without asking to start the bluetooth connection below.
4.) Now use the scale as a typical scale and see the weight change nearly instantaneously on the app. Note that there is a delay of about one or two seconds due to the Bluetooth communications. Note also that the Bluetooth connection is time limited to 3 minutes, 180 seconds, in order to reduce battery consumption.
5.) You may disconnect from the feature anytime by tapping on the "Disconnect" link on the top right.